Hi,
Welcome to Healthcaremagic.com.
I had gone through your question I can understand your concern.
The symptoms rated to your concern seems to be because of permanent
nerve damage. If it is 10years old there is no chances of recovery any more.
What you need to do is, reduce the
injury related to it. As there is no sensations, chances of the injury because of heat and chemicals are more. As you are not able to appreciate the proper stimulus you are unknowingly injuring hour tongue.
You need to keep following things in mind.
Take foods and drinks which are too hot and too
cold.
Clean your mouth before going to bed.
Use no or small amount of drinks during late night hours.
Keep a self routine check up of your mouth.
You can also use local
anesthetic agents for pain relief.
I hope your question is answered, you can write to us further if you feel any further assistance is required.
Regards
Dr Muzaffar Hussain Parray.